Small metal halide lamp

Details Small metal halide lamp Small metal halide lamp

1982-12-14

1987-01-06

Moore, David K.

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

313637, 313642, H01J 163, H01J 6120, H01J 6135

Patent

active

046349278

ABSTRACT:
This invention provides a small metal halide lamp which has a power input of 100 W or less, provided with: an arc tube having a pair of electrodes spaced apart from each other and containing a rare gas, mercury, sodium halide and scandium halide therein; and an envelope for housing the arc tube. The mixing ratio of sodium halide to scandium halide based on weight is 3:1 to 10:1, and the total content of the sodium halide and the scandium halide is 10 to 40 mg per unit volume (cc) of the arc tube. At least one phospor selected from the group consisting of a manganese-activated magnesium fluorogermanate phosphor and a cerium-activated yttrium aluminate phosphor is applied to the inner surface of the envelope. In addition, a green-emitting phosphor is preferably coated on the inner surface of the envelope.

REFERENCES:
patent: 3407327 (1968-10-01), Koury et al.
patent: 4023059 (1977-05-01), Anderson
patent: 4161672 (1979-07-01), Cap et al.
patent: 4171498 (1979-10-01), Fromm et al.
patent: 4423349 (1983-12-01), Nakajima

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